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首页> 外文期刊>Human movement science >The effect of using paddles on hand propulsive forces and Froude efficiency in arm-stroke-only front-crawl swimming at various velocities
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The effect of using paddles on hand propulsive forces and Froude efficiency in arm-stroke-only front-crawl swimming at various velocities

机译：使用划桨在手臂推进力和弗洛伊德效率的效果在各种速度下的手臂行程的前爬行中

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摘要

Through pressure measurement and underwater motion capture analysis, this study aimed to elucidate the effects of hand paddles on hand propulsive forces, mechanical power, and Froude efficiency in arm-stroke-only front-crawl swimming at various velocities. Eight male swimmers swam under two conditions in randomized order, once using only their hands and once aided by hand paddles on both hands. Each participant swam 10 times a distance of 16 m in each condition, for a total of 20 trials. To elucidate the relationship between propulsive forces and swimming velocity, each participant was instructed to swim each of the two sets of 10 trials at an arbitrarily different swimming velocity. During the trials, pressure sensors and underwater motion capture cameras were used together to analyze the pressure forces acting on the hand and hand kinematics, respectively. Six pressure sensors were attached to the right hand, and pressure forces acting on the right hand were estimated by multiplying the areas with the pressure differences between the palm and dorsal side of the hand. Acting directions of pressure forces were analyzed using a normal vector perpendicular to the hand or hand paddle, calculated from coordinates obtained using underwater motion capture analysis. As a result, there were no differences in propulsive forces and mechanical power to overcome water resistance (P-D) with or without hand paddles at the same swimming velocities. However, the use of hand paddles decreased stroke rate and hand velocities, so mechanical power to push the water at the hand (P-K) decreased. Using hand paddles thus increased Froude efficiency (eta(F)). These results suggest that training load decreases when swimmers swim at the same velocities while using hand paddles. This insight could prove useful for coaches and swimmers when using hand paddles for training to help ensure that they are used in accordance with their intended training purpose. If swimmers use hand paddles increasing propulsive force or P-K, they should swim at a higher swimming velocity with hand paddles than without.
机译：通过压力测量和水下运动捕获分析，本研究旨在阐明手桨在手边推进力，机械动力和弗洛伊德效率在各种速度下的手臂行程的前爬行游泳。八个男游泳运动员在随机顺序的两个条件下游泳，一次只使用双​​手并一旦双手用手划线。每个参与者在每种情况下都有10次距离16米的距离，总共有20个试验。为了阐明推进力和游泳速度之间的关系，每个参与者都被指示以任意不同的游泳速度以两组10种试验游泳。在试验期间，将压力传感器和水下运动捕获摄像机一起使用，分别分析在手和动力学上作用的压力。六个压力传感器附着在右手上，通过将手掌与手侧侧的压力差异乘以压力差异来估计作用在右手上的压力。使用垂直于手或手桨的正常矢量分析压力的作用方向，从使用水下运动捕获分析获得的坐标计算。结果，在相同的游泳速度下克服耐水性（P-D）的推进力和机械功率没有差异，以克服耐水性（P-D）。然而，使用手拉桨减小行程率和手速度，因此机械动力推动手（P-K）的水下降。因此，使用手拨片增加了FRoude效率（ETA（F））。这些结果表明，当游泳运动员在使用手拉划线时游泳时，训练负荷减少。这种洞察力可以证明在使用手桨以进行培训时对教练和游泳者来说有用，以帮助确保按照其预期的培训目的使用它们。如果游泳者使用手拨片，增加推进力或p-k，它们应该在较高的游泳速度与手拉划线游泳而不是没有。

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